Product Overview
Acid washed coal carbon decolorization DCS is an acid-washed coal-based granular activated carbon engineered for decolorization and purification applications where pH stability is critical. Manufactured from select bituminous coal through carbonization, steam activation, and extended acid washing, it achieves a neutral pH range of 5–8 while maintaining high adsorption capacity.
Available in two mesh configurations—DCS 830 and DCS 1240—this grade delivers iodine adsorption exceeding 950 mg/g and methylene blue above 160 mg/g. The acid-washing protocol removes soluble ash and alkaline residues, making DCS ideal for pharmaceutical, sugar, and chemical processing where standard coal carbons would introduce pH excursions or metallic contamination.
Key Application Areas
- Organic Acid Purification — Removes color bodies and impurities from organic acid process streams without altering acid chemistry or introducing alkaline contaminants.
- Inorganic Acid Treatment — Polishes inorganic acids by adsorbing organic contaminants and trace color bodies, maintaining product clarity and specification compliance.
- Chemical Processing & Purification — Purifies intermediates, solvents, and fine chemicals where pH-neutral adsorption prevents unwanted side reactions.
- Sugar Decolorization — Treats cane and beet sugar syrups to achieve target brightness while maintaining neutral pH that avoids inversion or degradation of sucrose.
- Pharmaceutical Purification — Decolorizes active pharmaceutical ingredients and excipients where low ash and pH stability are required for regulatory compliance.
Specifications
| Technical Specifications | DCS 830 | DCS 1240 | Unit |
|---|---|---|---|
| Iodine Adsorption Value | >950 | >950 | mg/g |
| Moisture Content | <5 | <5 | % -wt |
| Methylene Blue Adsorption Value | >160 | >160 | mg/g |
| pH | 5-8 | 5-8 | - |
| Average Particle Size | 1.4-1.7 | 1.2-1.4 | mm |
| Crush Strength | >90 | >90 | % |
| Specific Surface Area | >900 | >900 | m²/g |
| Particle Size >8 Mesh (1.70 mm) | <10 | - | % -wt |
| Particle Size >12 Mesh (1.70 mm) | - | <5 | % -wt |
| Particle Size <30 Mesh (0.6 mm) | <5 | - | % -wt |
| Particle Size <40 Mesh (0.43 mm) | - | <5 | % -wt |
Available particle size
- 8×30 Mesh ( 0.6 ~ 2.36 mm)
- 12×40 Mesh ( 0.43 ~ 1.7 mm)
Packaging
- The 25kg / Package
- The 500 kg / Package
Key Advantages
- Acid-Washed pH Stability: The 5–8 pH range eliminates alkaline spikes common in standard coal carbons, protecting pH-sensitive processes and reducing post-treatment correction needs.
- Dual-Indicator Performance: Iodine >950 mg/g ensures rapid small-molecule adsorption, while methylene blue >160 mg/g confirms effective large-molecule and color body removal.
- Low Extractable Content: Acid washing reduces soluble ash and metal ions, minimizing contamination risk in pharmaceutical and food-contact applications.
- Dual Mesh Options: DCS 830 (1.4–1.7 mm) suits high-flow systems; DCS 1240 (1.2–1.4 mm) offers enhanced kinetics for tighter purification requirements.
How DCS Enables Acid Washed Coal Carbon Decolorization
Standard coal-based activated carbons naturally exhibit alkaline pH due to residual ash and mineral content. In pharmaceutical, sugar, and fine chemical processing where strict pH stability is required, this alkalinity may necessitate post-treatment pH adjustment to maintain process specifications and effluent compliance.
DCS solves this through rigorous acid washing. The acid washed coal carbon decolorization protocol removes soluble ash and alkaline residues, achieving a stable pH of 5–8 without compromising the carbon pore structure. When processing pH-sensitive liquids such as organic acids, sugar syrups, or pharmaceutical intermediates, the neutral surface chemistry prevents unwanted reactions while the high iodine and methylene blue values ensure rapid adsorption of color bodies and impurities. The result is clean, stable purification without downstream pH adjustment.
DCS vs Standard DC Coal Granular Carbon
Standard DC coal granular carbon provides reliable decolorization with natural pH for general applications. However, in acid-sensitive processes like sugar syrup treatment or pharmaceutical purification, the natural alkaline pH of standard coal carbons may require post-treatment pH adjustment to meet strict effluent specifications.
DCS bridges this gap as the acid washed coal carbon decolorization alternative. The additional acid-washing step achieves pH 5–8 and reduces extractable metals, making it preferable for applications where pH stability and low leachable content are required. While both grades share the same coal base and high mechanical strength, DCS is specifically selected when process stability and low leachable content are required. Choose DC for general decolorization; select DCS for acid-sensitive acid washed coal carbon decolorization in sugar, pharmaceutical, and chemical processing.